-2.09% is the change from 430 to 421
Calculation steps:
[( 421 - 430 ) ÷ 430] x 100 = -2.09%
Formula
Percentage change = [(421 - 430) / 430] x 100
Subtract the new number by the original number
421 - 430 = -9
-9 ÷ 430 = -0.020930232558139535
-0.020930232558139535 x 100 = -2.09%